Olefin polymer compositions containing polyorganosiloxanes and the use thereof in the production of film material and polyorganosiloxanes

ABSTRACT

The present invention relates to olefin polymer compositions which can be extruded into film material characterized by improved stability and optical properties. In particular, this application is directed olefin polymer compositions containing specific polyorganosiloxanes bearing a hydroxyl functionality.

This patent application is a continuation-in-part of patent applicationsSer. No. 176,081 and 176,090, both filed on Mar. 31, 1988 and both nowabandoned.

FIELD OF THE INVENTION

The present invention is directed to olefin polymer compositions whichcan be extruded into a film which exhibits improved stability andoptical properties. In particular, the present invention is directed toolefin polymer compositions containing polyorganosiloxanes which havehydroxyl functionality, and the polyorqanosiloxanes per se.

BACKGROUND OF THE INVENTION

It is well known that residues from the polymerization of alpha-olefinpolymers using Ziegler-Natta catalysis show adverse effects on bothstability and product color of films in which they are found. Increasedamounts of stabilizers are needed to off set such deleterious effectsfrom the catalyst residue. The adverse interactions typically result, inpart, from the reactions of transition metal residues with phenolicantioxidants or their breakdown products. Chloride residues can reactwith the phenolic antioxidants catalyzing dealkylation and promotingautoxidation. Further, phenolate salts or coordination complexes canform that are chromophores.

The industry-wide approach has been to add metallic stearates of zinc,magnesium, and/or calcium as acid acceptors with the phenolicantioxidants. However, the use of metallic stearates can cause plateoutor die lip buildup problems. They can also interfere with heat sealingand ink adhesion.

Certain polyols such as glycerol, sorbitol, or pentaerythritol, or theirmono esters with fatty acids, have also been reported to give additionalcolor improvements.

The polyols are not always found to have a positive effect on colorimprovement. The variable effectiveness of the polyols may be, in part,due to their solubility limitations and their inability to reach thecatalyst residue.

Ultrafine zinc oxide or hydrotalcite (a hydrate of magnesiumcarbonate/aluminum hydroxide) can be used to replace the metallicstearates. However the use of these inorganic materials can give rise todispersion problems. Moreover, such inorganic neutralizers by themselvesor when wetted with small amounts of metallic stearate are not effectivein controlling discoloration.

It is therefore an object of the present invention to provide apolyolefin composition which exhibits stability against the deleteriouseffects normally caused by catalyst residues present therein.

It is further an object of the present invention to provide a polyolefincomposition which exhibits improved optical properties.

It has been found that the objects of the present invention are achievedby incorporation into polyolefin compositions of specificpolyorganosiloxanes bearing hydroxyl functionality.

The use of polyorganosiloxanes as additives in polymer compositions isgenerally known. For instance, U.S Pat. No. 3,879,491 discloses theproduction of thermoplastic compositions containing from 1 to 15 weightpercent of a hydroxy end-blocked polydiorganosiloxane. U.S. Pat. No.4,430,235 discloses polydiorganosiloxane-based polymeric antioxidants,such as ##STR1## wherein Me represents a methyl group. U.S. Pat. No.4,535,113 discloses polyolefin compositions having improved opticalproperties containing polydiorganosiloxanes bearing ethylene oxide,vicinal epoxy, or amino functionalities.

SUMMARY OF THE INVENTION

The present invention is directed to a polyorganosiloxane andcomposition comprising an olefin polymer and the polyorganosiloxane. Thepolyorganosiloxane has the following nominal formula: ##STR2## whereinR, which may be the same or different, represents an alkyl group havingfrom 1 to 4 carbon atoms;

R¹ represents the group --R⁴ --(N)_(b) --(O)_(c) --R⁵ ;

R² represents the group --(CH₂)_(d) --R wherein R is as previouslydefined;

R³, which may be the same or different, represents R or R² ;

R⁴ represents a straight or branched chain alkylene group having 1 to 15carbon atoms;

R⁵ represents hydrogen; (CH₂)_(a) CHOHCH₂ OH; or [(CH₂)_(e) OH]_(f)H_(2-f) ;

a is an integer having a value of 1 to 15;

b has a value of 0 or 1;

c has a value of 0 or 1;

d is an integer having a value of 3 to 50;

e has a value of 1 or 2;

f has a value of 1 or 2;

x has a value ranging from about 1 to about 200;

y has a value ranging from about 1 to about 200; and

z has a value ranging from 0 to about 200; with the proviso that:

if R⁵ is hydrogen or (CH₂)_(a) CHOHCH₂ OH, b is 0 and c is 1; and

if R⁵ is [(CH₂)_(e) OH]_(f) H_(2-f), b is 1 and c is 0.

DETAILED DESCRIPTION OF THE INVENTION

The present invention provides polyolefin compositions containing olefinpolymers and polyorganosiloxanes having hydroxyl functionality, whichcan be extruded into a film which is characterized by improved stabilityand optical properties, as well as the polyorganosiloxanes themselves.

The polyorganosiloxanes useful in the practice of the present inventionhave the following nominal formula: ##STR3## wherein R, which may be thesame or different, represents an alkyl group having from 1 to 4 carbonatoms;

R¹ represents the group --R⁴ --(N)_(b) --(O)_(c) --R⁵ ;

R² represents the group --(CH₂)_(d) --R wherein R is as previouslydefined;

R³, which may be the same or different, represents R or R² ;

R⁴ represents a straight or branched chain alkylene group having 1 to 15carbon atoms;

R⁵ represents hydrogen; (CH₃)_(a) CHOHCH₂ OH; or [(CH₂) _(e) OH]_(f)H_(2-f) ;

a is an integer having a value of 1 to 15;

b has a value of 0 or 1;

c has a value of 0 or 1;

d is an integer having a value of 3 to 50;

e has a value of 1 or 2;

f has a value of 1 or 2;

x has a value ranging from about 1 to about 200;

y has a value ranging from about 1 to about 200; and

z has a value ranging from 0 to about 200; with the proviso that:

if R⁵ is hydrogen or (CH₂)₁ CHOHCH₂ OH, b is 0 and c is 1; and

if R⁵ is [(CH₂)_(e) OH]_(f) H_(2-f), b is 1 and c is 0.

Preferably, R represents a methyl group.

Preferably x has a value ranging from about 5 to about 20. Preferably yhas a value ranging from about 5 to about 20. Preferably z has a valueranging from 0 to about 20. Furthermore, it is preferred that x/y has avalue of from about 1 to about 9 and z/x has a value of from 0 to about1.

Preferably, a has a value of from about 3 to about 12.

Most preferred compounds for use in the practice of the claimedinvention are compounds wherein R¹ is:

--R⁴ --OH,

--R⁴ --N--(CH₂ CH₂ --OH)₂,

--R⁴ --NH--CH₂ CH₂ OH, or

--R⁴ --O--(CH₂)_(a) CHOHCH₂ OH, and a has a value from about 3 to about12.

Specific compounds among those most preferred polyorganosiloxanecompounds for use in the practice of the claimed invention are compoundswherein:

1) x=15, y=5, z=0, R¹ =--(CH₂)₃ --OH;

2) x=13, y=5, z=0, R¹ =--(CH₂)₃ --OH;

3) x=10, y=10, z=0, R¹ =--(CH₂)₃ --OH;

4) x=15, y=5, z=0, R¹ =--(CH₂)₃ --N(C₂ H₄ OH)₂ ;

5) x=13, y=5, z=0, R¹ =--CH₂ --CH(CH₃)--CH₂ OH;

6) x=10, y=5, z=5, R¹ =--(CH₂)₃ OH, R² =--(CH₂)₁₁ --CH₃ and is pendant;

7) x=10, y=5, z=0, R¹ =--(CH₂)₃ --O--CH₂ --CHOH--CH₂ OH; and

8) x=13, y=5, z=0, R¹ =--(CH₂)₃ --O--CH₂ --CHOH--CH₂ OH.

The polyorganosiloxanes of the present invention can be prepared bymeans well known to those skilled in silicone chemistry. For example,the precursor of the polysiloxanes of this invention, has the nominalformula: ##STR4## wherein the variables are as previously defined andcan be conveniently prepared by reacting a mixture containinghexamethyldisiloxane, octamethylcyclotetrasiloxane, trimethyl endblocked methyl hydrogen polysiloxane, and an acid catalyst. The numberof repeating units can be varied, as desired, by varying the mole ratioof the reactants. A specific procedure for preparing a precursor fallingwithin the scope of the above formula is set forth in Example 2 of U.S.Pat. No. 4,046,930 granted Sept. 6, 1977. The precursor of Formula II isthen reacted with an alpha olefin of various chain lengths containingthe terminal functionality necessary to produce the group denoted by R¹as herein defined. If z is to have a value greater than zero, alsopresent in the reaction should be an alpha-olefin having from about 4 toabout 50 carbon atoms to produce a polysiloxane having a functionaltyrepresented as R² in Formula I. The ratio of R¹ to R² groups, expressedas subscripts y and z as set forth in Formula I, may be varied throughvariation of the molar ratios of the hydroxy-substituted alpha-olefinand the unsubstituted alpha-olefinic reactant described above. Thisreaction may be conducted in the presence of a platinum catalyst such aschloroplatinic acid. Where z is 0, and R³ is R², the group --(CH₂)_(d)--R can be added as an end group.

Olefin polymers suitable for use in this invention are normally solidmaterials and include homopolymers of olefins as well as interpolymersof one or more olefins with each other and/or up to about 30 percent byweight of one or more monomers which are copolymerizable with sucholefins. Homopolymers and interpolymers of such olefins as ethylene,propylene, butene-1, isobutylene, hexene-1, 4-methyl-pentene-1,pentene-1, octene-1, nonene-1, and decene-1, as well as interpolymers ofone or more of such olefins and one or more of other monomers which areinterpolymerizable with such alpha-olefins, such as vinyl and dienecompounds, are suitable for the purposes of this invention.

Exemplary interpolymers are ethylene copolymers such asethylene-propylene copolymers, ethylene-butene-1 copolymers,ethylene-hexene 1 copolymers, ethylene-octene-1 copolymers, polymers ofethylene and two or more of the following compounds: propylene,butene-1, hexene-1, 4-methyl-pentene-1, octene-1, and the like.

Also included in the term olefin polymer are blends of one polymer withone or more other polymers. Illustrative of such blends are theethylene/olefinic polymers with one or more of the following:polypropylene; high pressure, low-density polyethylene; high densitypolyethylene; polybutene-1, and polar monomer containing olefincopolymers such as ethylene/acrylic acid copolymers; ethylene/methylacrylate copolymers; ethylene/ethyl acrylate copolymers; ethylene/vinylacetate copolymers; ethylene/acrylic acid/ethyl acrylate terpolymers,ethylene/acrylic acid/vinyl acetate terpolymers, and the like.

Preferred ethylene polymers for purposes of this invention are lowpressure, substantially linear ethylene homopolymers and ethylene-C₃ toC₈ alpha olefin interpolymers having a density of about 0.850 to about0.970, preferably about 0.875 to about 0.930. These interpolymers can beprepared by reacting a mixture containing about 50 to 99.9 mole percent,preferably about 75 to 96 mole percent ethylene and from about 0.1 to 50mole percent and preferably about 4 to about 25 mole percent of one ormore C₃ to C₈ alpha olefins such as propylene, butene-1, pentene-1,4-methyl pentene-1, hexene-1, heptene-1, octene-1 and the like, using amagnesium chloride/titanium chloride catalyst and employing lowpressures on the order of about 15 to 300 psi as disclosed in U.S. Pat.No. 4,302,565.

Particularly preferred olefin polymers are ethylene/butene-1 copolymerscontaining up to 30 weight percent butene-1; ethylene/hexene-1copolymers containing up to 30 weight percent hexene-1; said copolymersadditionally based on up to 10 weight percent of propylene comonomer;ethylene/propylene copolymer containing up to 60 weight percentpropylene; and ethylene/propylene/ diene terpolymer containing up to 50weight percent propylene and up to 12 weight percent diene such asethylidene norbornene.

The polysiloxanes of Formula I are added to the olefin polymers inamounts sufficient to improve the stability and/or optical properties ofthe final olefin compositions. As a general rule, the amounts ofpolyorganosiloxanes used in the practice of the present invention rangefrom about 0.005 to about 0.5 percent by weight, preferably about 0.02to about 0.05 percent by weight, based on the total weight of the finalolefin polymer composition.

The admixture of the polyorqanosiloxanes of Formula I and olefinpolymers can be conveniently effected in a suitable mixer such as aBanbury mixer.

To the compositions of this invention can be also added variousmaterials commonly added to extrudable compositions. These materialsinclude additives such as fillers, e.g., Mg(OH)₂ in amounts up to 60weight percent of the final olefin polymer composition; calciumcarbonate; and talc; colorants, e.g., TiO₂ and carbon black; pigmentsother than TiO₂ ; lubricants; slip agents; antioxidants; and antiblockagents, in amounts well known in the art.

Whereas the exact scope of the instant invention is set forth in theappended claims, the following specific examples are provided to furtherillustrate certain aspects of the present invention. These examples areset forth for illustration only and are not to be construed aslimitations on the present invention. All parts and percentages are byweight unless otherwise specified.

The patents mentioned in this specification are incorporated byreference herein.

EXAMPLES

Experimental results are presented in Tables I to IV. In all Examples,the additives were dry blended into the granular polyethylenes ashereinafter defined. The test compositions were than extruded using aBrabender®tape extruder at 200 degrees Celsius. Melt index, flow index,yellowness index, and differential scanning calorimetric induction timeswere then determined.

DEFINITIONS

Polyolefin A represents an ethylene/1-butene copolymer compositioncontaining a catalyst composition within the scope of U.S. Pat. No.4,508,842.

Polyolefin B represents a polyethylene composition containing a catalystcomposition within the scope of U.S. Patent No. 4,302,566.

Polyolefin C represents a polypropylene composition containing acatalyst composition within the scope of U.S. Pat. No. 4,302,566.

PS A (polyorganosiloxane A) represents a polyorganosiloxane of Formula Iwherein x has a value of 15; y has a value of 5; z has a value of 0; Rrepresents methyl; R¹ represents --(CH₂)₃ --OH; and R³ representsmethyl.

PS B (polyorganosiloxane B) represents a polyorganosiloxane of Formula Iwherein x has a value of 10; y has a value of 10; z has a value of 0; Rrepresents methyl; and R¹ represents --(CH₂)₃ --OH; and R³ representsmethyl.

Additive 1 represents octadecyl 3-(3, 5 ditertbutyl 4 hydroxy phenyl)propionate.

Additive 2 represents zinc stearate.

Additive 3 represents zinc oxide.

Additive 4 represents hydrotalcite.

Additive 5 represents tris (2, 4-di-tert butyl phenyl) phosphite.

Additive 6 represents gylcerol monostearate.

Additive 7 represents triethanol amine.

Additive 8 represents a linear polymethysiloxane having about 200dimethylsiloxane units.

Additive 9 represents gylcerol.

Additive 10 represents tetrakis[methylene(3,5-di-tert-butyl-4-hydroxyhydrocinnamate)]methane marketed byCiba-Geigy as Irganox®1010.

Additive 11 represents distearyl thiodipropionate.

Additive 12 represents calcium stearate.

Yellowness Index was determined in accordance with ASTM D-1925-70. APacific Scientific Colorgard System®/05 instrument was used in thedetermination of color.

DSC-OIT represents Differential Scanning Calorimetry-Oxidative InductionTime as determined on a DuPont Thermal Analyzer®. This measurementrelates to oxidative stability of the polyolefin at elevatedtemperatures. DSC-OIT data varies directly with thermal oxidativestability of the polyolefin.

Melt Index, Flow Index and Melt Flow Ratio represent the melt viscosityof the polyolefin at a prescribed temperature under various pressure inaccordance with ASTM D-1238 conditions E and F. Data was collected withthe aid of a Tinius-Olsen Plastograph® instrument.

General Procedure

The procedure set forth below was used in the performance of thefollowing Examples and Comparative Examples.

Each component was first diluted in a separate portion of the olefinpolymer in a concentration of 5 weight percent to make a masterbatch.Use of the resulting masterbatch allowed for more accurate addition ofthe desired additives into the final resin composition. Accuratelyweighed portions of the respective masterbatches were then added to thebalance of the resin. The resulting mixture was then shaken in a plasticbag for 5 minutes to ensure thorough mixing and dispersion.

Each resin mixture was then extruded with a BrabenderPlasticorder®extruder fitted with a 1 inch extruder screw, a 25:1length/diameter ratio and a 4 inch x 0.125 inch steel tape die. Allzones of the extruder, as well as the die, were heated to 200° C. priorto the performance of the balance of the procedure.

The extruder was then purged for 10 minutes at 50 rpm with additionalquantities of the olefin resin followed by introduction of theexperimental resin mixture. The resin sample was then extruded for aperiod of 5 minutes and collected as a 0.02 inch tape. The extruder wasthen purged with additional quantities of the olefin resin prior to theintroduction of a subsequent experimental resin mixture.

                                      TABLE I                                     __________________________________________________________________________    Compositions                                                                  __________________________________________________________________________    Polyolefin A  100.                                                                              99.98                                                                            99.93                                                                            99.82                                                                            99.93                                                                            99.91                                                                            99.91                                        Additive 1    --  0.02                                                                             0.02                                                                             0.02                                                                             0.02                                                                             0.02                                                                             0.02                                         Additive 2    --  -- 0.05                                                                             0.05                                                                             -- -- --                                           Additive 3    --  -- -- -- -- 0.02                                                                             0.02                                         Additive 4    --  -- -- 0.05                                                                             -- -- --                                           Additive 5    --  -- -- 0.06                                                                             -- -- --                                           PS A          --  -- -- -- 0.05                                                                             0.05                                                                             --                                           PS B          --  -- -- -- -- -- 0.05                                         Yellowness Index                                                                            13. 22.                                                                              18.                                                                              6.2                                                                              5.4                                                                              10.                                                                              8.3                                          DSC OIT @ 180° C., (min.)                                                            0.3 5.1                                                                              3.9                                                                              7.3                                                                              9.1                                                                              8.6                                                                              15.7                                         Melt Flow Properties                                                          Melt Index, dg/min                                                                          0.92                                                                              0.99                                                                             1.14                                                                             1.18                                                                             1.12                                                                             1.19                                                                             1.15                                         Melt Flow Ratio                                                                             68.0                                                                              65.0                                                                             61.                                                                              59.                                                                              60.0                                                                             58.                                                                              60.                                          __________________________________________________________________________

                                      TABLE II                                    __________________________________________________________________________    Compositions                                                                  __________________________________________________________________________    Polyolefin A  100.                                                                              99.97                                                                            99.92                                                                            99.92                                                                            99.92                                                                            99.92                                                                            99.92                                                                            99.92                                                                            99.87                                  Additive 6    --  -- -- 0.05                                                                             -- -- -- -- --                                     Additive 7    --  -- -- -- 0.05                                                                             -- -- -- --                                     PS A          --  -- -- -- -- -- 0.05                                                                             -- --                                     PS B          --  -- -- -- -- -- -- 0.05                                                                             0.05                                   Additive 8    --  -- 0.05                                                                             -- -- -- -- -- --                                     Additive 2    --  -- -- -- -- 0.05                                                                             -- -- --                                     Additive 4    --  -- -- -- -- -- -- -- 0.025                                  Additive 3    --  -- -- -- -- -- -- -- 0.025                                  Additive 1    --  0.03                                                                             0.03                                                                             0.03                                                                             0.03                                                                             0.03                                                                             0.03                                                                             0.03                                                                             0.03                                   Yellowness Index                                                                            8.0 13.                                                                              14.                                                                              11.                                                                              36.                                                                              11.                                                                              6.6                                                                              6.7                                                                              3.5                                    DSC-OIT @ 190° C. (min.)                                                             <0.5                                                                              2.5                                                                              -- -- -- -- 9.1                                                                              11.                                                                              --                                     __________________________________________________________________________

                                      TABLE III                                   __________________________________________________________________________    Compositions                                                                  __________________________________________________________________________    Polyolefin B  100.                                                                              99.97                                                                            99.95                                                                             99.95                                                                            99.95                                                                            99.92                                                                            99.92                                                                             99.92                                                                            99.87                                                                             99.81                            Additive 9    --  -- --  0.5                                                                              -- -- --  -- --  --                               Additive 7    --  -- --  -- 0.05                                                                             0.05                                                                             --  -- --  --                               PS A          --  -- 0.05                                                                              -- -- -- 0.05                                                                              -- --  --                               PS B          --  -- --  -- -- -- --  0.05                                                                             --  0.05                             Additive 2    --  -- --  -- --    --  -- --  0.05                             Additive 4    --  -- --  -- -- -- --  -- 0.025                                                                             0.05                             Additive 3    --  -- --  -- -- -- --  -- 0.025                                                                             --                               Additive 1    --  0.03                                                                             --  -- -- 0.03                                                                             0.03                                                                              0.03                                                                             0.03                                                                              0.03                             Additive 5    --  -- --  -- -- -- --  -- --  0.06                             Yellowness Index                                                                            3.2 14.                                                                              -3.6                                                                              2.4                                                                              24.                                                                              15.                                                                              -1.0                                                                              -1.8                                                                             -2.4                                                                              5.6                              DSC-OIT @ 180° C. (min.)                                                             <0.5                                                                              2.5                                                                              --  -- -- -- 9.1 11.    --                               __________________________________________________________________________

                  TABLE IV                                                        ______________________________________                                        Compositions (pct.)                                                           ______________________________________                                        Polyolefin C   99.63  99.68    99.73                                                                              100.                                      Additive 1     0.1    0.1      0.1  --                                        Additive 11    0.2    0.1      --   --                                        Additive 12    0.07   0.07     0.07 --                                        PS A           --     0.05     0.10 --                                        Yellowness Index                                                                             6.2    6.7      6.2  17.                                       DSC OIT,       8.6    15.0     15.2 <0.5                                      @ 180° C. (min.)                                                       ______________________________________                                    

As shown through the above Examples and Comparative Examples, thecompositions of the present invention exhibit improved oxidationresistance and reduced color when compared to unstabilized polyolefincompositions. The compositions of the present invention further exhibitimproved oxidation resistance and/or reduced color when compared toother stabilized polyolefin compositions.

We claim:
 1. A composition comprising an olefin polymer and apolyorganosiloxane of the following nominal formula: ##STR5## wherein R,which may be the same or different, represents an alkyl group havingfrom 1 to 4 carbon atoms;R¹ represents the group --R⁴ --(N)_(b)--(O)_(c) --R⁵ R² represents the group --(CH₂)_(d) --R wherein R is aspreviously defined; R³, which may be the same or different, represents Ror R² ; R⁴ represents a straight or branched chain alkylene group having1 to 15 carbon atoms; R⁵ represents hydrogen; (CH₂)_(a) CHOHCH₂ OH; or[(CH₂)_(e) OH]_(f) H_(2-f) ; a is an integer having a value of 1 to 15;b has a value of 0 to 1; c has a value of 0 to 1; d is an integer havinga value of 3 to 50; e has a value of 1 or 2; f has a value of 1 or 2; xhas a value ranging from about 1 to about 200; y has a value rangingfrom about 1 to about 200; and z has a value ranging from 0 to about200; with the proviso that: if R⁵ is hydrogen or (CH₂)_(a) CHOHCH₂ OH, bis 0 and c is 1; and if R⁵ is [(CH₂)_(e) OH]_(f) H_(2-f), b is 1 and cis 0 wherein the polyorganosiloxane is present in an amount of about0.005 to about 0.5 percent by weight based on the weight of thecomposition.
 2. The composition of claim 1 wherein R represents a methylgroup, x has a value of from about 5 to about 20, y has a value of about5 to about 20, and z has a value of 0 to about
 20. 3. The composition ofclaim 1 wherein R represents a methyl group, x/y has a value of fromabout 1 to about 9 and z/y has a value of from 0 to about
 1. 4. Thecomposition of claim 1 wherein R represents a methyl group and R¹represents the group --R⁴ --OH.
 5. The composition of claim 4 wherein zis at least about one.
 6. The composition of claim 4 wherein thealkylene group has 2 to 12 carbon atoms.
 7. The composition of claim 5wherein the alkylene group has 2 to 12 carbon atoms and d has a value offrom 3 to
 20. 8. The composition of claim 1 wherein R represents amethyl group and R¹ represents the group --R⁴ --N--[(CH₂)_(e) OH]_(f)H_(2-f).
 9. The composition of claim 8 wherein z is at least about one.10. The composition of claim 8 wherein the alkylene group has 2 to 12carbon atoms.
 11. The composition of claim 10 wherein z is at leastabout one and d has a value of from 3 to
 20. 12. The composition ofclaim 1 wherein R is a methyl group and R¹ represents the group --R⁴--O--(CH₂)_(a) CHOHCH₂ OH and a has a value of from 2 to
 12. 13. Thecomposition of claim 8 wherein z is at least about one.
 14. Thecomposition of claim 1 wherein R is a methyl group and R¹ represents thegroup --CH₂ CH(CH₃)CH₂ OH.
 15. The composition of claim 1 wherein R¹ isR⁴ --NH--CH₂ CH₂ OH.
 16. The composition of claim 1 wherein R¹ is R⁴--N--(CH₂ CH₂ OH)₂.
 17. The composition of claim 1 wherein R¹ is R⁴--O--(CH₂)_(a) CHOHCH₂ OH.
 18. The composition of claim 1 wherein z is0; R is methyl; and at least one R³ is R².
 19. The composition of claim1 wherein R and R³ are methyl and z is at least about one.
 20. Thecomposition of claim 1 wherein x is 15; y is 5; z is 0; R and R³ aremethyl; and R¹ is --(CH₂)₃ OH.
 21. The composition of claim 1 wherein xis 10; y is 10; z is 0; R and R³ are methyl; and R¹ is --(CH₂)₃ OH. 22.A composition comprising an olefin polymer and a polyorganosiloxane ofthe following formula: ##STR6##
 23. A composition comprising an olefinpolymer and a polyorganosiloxane of the following nominal formula:##STR7##